This wholesome summer fruit crisp is one to add to the archives, since you'll want to return to it again and again. It's full of healthy upgrades, including whole-grain flour, oats, dates, and olive oil. It's still very much dessert and entirely delicious. Use any strone fruit if making this during the summer and apples or pears during the off-season.
Preheat oven to 350 F.
In a food processor with a metal blade, pulverize the dates with olive oil into tiny pieces until they begin to come together in a dark clump.
Transfer the dates to a medium bowl, being sure to scrape the olive oil off the sides and into the bowl. Add the flour, oats, brown sugar, walnuts, cinnamon, cardamom, and salt. Use a fork to mix the ingredients together, breaking up the clump of dates. Once slightly mixed, use your hands to continue to break up the mixture into pea-size crumbles that are relatively even in size.
In a large bowl, put the peaches, berries, cornstarch, lemon juice, and brown sugar and toss until the fruit is evenly coated. Taste and add a little more brown sugar if the fruit is fairly tart. Transfer to a baking pan large enough that the fruit approaches the top, such as an 8-inch square or round pan, a 7x9-inch rectangular pan, or an oval casserole. Sprinkle the Crisp Topping over the fruit.
Serve as is or with a scoop of ice cream or dollop of my Yogurt Whipped Cream or Crème Fraîche Whipped Cream (see notes).
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